firebase - Cloud Firestore serving outdated data

Question

In the last day, I have started having trouble with Cloud Firestore serving outdated data to my Flutter app running on android. I tried clearing the cache for the app, uninstalling/reinstalling with no success. Still Firestore kept serving the outdated data. Then I tried disabling persistence with the persistenceEnabled: false at startup. It stopped serving the outdated data, but now it doesn't return current data that should be returned! Any suggestions to check what might be going on?

Edit: I should mention that this is happening on a collectionGroup query for which the index has been built. I've checked the database rules, and there are not any denies or errors resulting from this query.

question from:https://stackoverflow.com/questions/65905387/cloud-firestore-serving-outdated-data

Answer 1

Turns out I changed one of my Collection group queries recently and needed to update the index. So if you have Cloud Firestore queries that are acting erratic like mine was, check out your logcat or console log for an error like this:

Unhandled Exception: [cloud_firestore/failed-precondition] Operation was rejected because the system is not in a state required for the operation's execution. If performing a query, ensure it has been indexed via the Firebase console.

Firestore is supposed to provide a URL to build the appropriate index, but in my case the URL did not appear so I had to add it manually.